Increased Catch-up in 2025 - Optional?

Do we know for certain if the increased catch-up limit for ages 60 through 63 is mandatory if a plan allows catch-up contributions, or is the increased limit optional so the same catch-up limit could continue apply to all catch-up eligible as in pre-2025 if the plan wishes to do so?

I've seen what I thought was a reliable source indicate that the change appears mandatory if the plan offers catch-up, but more guidance is required.  I've also just received information from a recordkeeper that is indicating the decision to have catch-up and not have the increased limits is optional.

Thanks.

See these BenefitsLink discussions:

https://benefitslink.com/boards/topic/71721-secure-20-60-63-catch-ups-optional-or-mandatory/

https://benefitslink.com/boards/topic/70655-increased-catch-up-limit-for-ages-60-63-mandatory/

https://benefitslink.com/boards/topic/72570-60-63-catch-ups-automatically-incorporated-relius-documents/.